First of all please ignore the red balls connecting his hands to his arms.

Adin was once a lonely ice being trapped on a floating glacier when his "boat" ran aground in metru nui where at that time he original toas were getting ready to bestow the honors of toa onto a new group of matorans. Adin was fasciated by this ceremony and came too close to the warp field that was transferring energy. He was then infused with a piraka spine and is now a member of the warriors known as piraka toas.